Module subpathing required to import types

[yo1dog]

To import types, one must import them from module subpaths. This ties projects to the module's internal file structure, which is against best practices, and could make any internal file renaming/restructuring a breaking change.

Instead, you could expose the types from the module root using a namespace as described in #410.

For example, currently one must:

import type {FetchedMessage} from 'pubnub/lib/types/core/types/api/history';

Using the namespace you could instead do:

declare namespace PubNub {
  export * from '../core/types/api/history';
  ...
}

import {FetchedMessage} from 'pubnub';

Or, keeping the types namespaced:

declare namespace PubNub {
  export * as History from '../core/types/api/history';
  ...
}

import * as PubNub from 'pubnub';
let myMessages: PubNub.History.FetchedMessage[];

[parfeon]

Created a script which will merge all type definitions created by tsc into a single file.
Common types (for whole library) part of the root PubNub namespace and specific API grouped under respective nested namespaces.

import PubNub, {PubNubConfiguration, Publish, History} from 'pubnub';

// PubNub client configuration.
let configuration: PubNubConfiguration = {
  publishKey: 'secret', 
  subscribeKey: 'secret', 
  userId: 'user-1'
}; 

// Fetch messages configuration.
let fetchParameter: History.FetchMessagesParameters = {
  channels: ['channel-1']
};